Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 919 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 714 + 258 = 977 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 16 × 26 = 416 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 50 × 78 = 3898 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 44 × 33 = 1452 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 753 + 823 = 1574 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 267 + 505 = 772 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 298 + 588 = 886 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 25 × 62 = 1550 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 76 × 59 = 4483 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 697 + 442 = 1145 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 16 × 72 = 1149 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 42 × 44 = 1857 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 26 × 69 = 1794 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 24 × 33 = 792 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 629 + 669 = 1298 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 61 × 20 = 1220 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 51 × 55 = 2812 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 53 × 76 = 4028 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 13 × 47 = 609 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 298 + 489 = 793 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 484 + 445 = 921 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 946 + 663 = 1605 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 153 + 504 = 657 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 27 × 62 = 1674 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 66 × 54 = 3569 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 68 × 17 = 1165 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 217 + 378 = 595 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 32 × 49 = 1561 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 923 + 264 = 1187 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 66 × 90 = 5940 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 246 + 858 = 1104 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 468 + 453 = 915 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 14 × 97 = 1366 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 328 + 937 = 1265 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 35 × 52 = 1823 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 945 + 670 = 1615 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 95 × 69 = 6547 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 94 × 44 = 4136 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 324 + 861 = 1185 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 82 × 22 = 1804 right or wrong? (a) Right (b) Wrong

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